What was Abraham Lincoln's religion?

Answer:

With regard to religion Lincoln is most commonly cited as a deist, but his affiliation is pretty much ambiguous. His parents were Baptist and they signed him up in their church as a lad, after his son's death he dabbled in Spiritualism (a popular end of the 1800's semi-religious activity). He read the holy books and made vows, but never attended any church. Atheists claim him, theists do too. His lack of an obvious religion was used against him in his campaigns.

He is best described as a private man who kept his own counsel.